Brick installation kit, and associated methods of assembly and fireplace systems

A brick installation kit configured to be installed in a firebox, the brick installation kit comprising:

• a plurality of retention brackets, including a first retention bracket including a plurality retention slots,
• a plurality of retention clips, each retention clip having a head and a foot receivable in a corresponding one of the plurality of retention slots, and
• a plurality of brick panels, each brick panel having a first edge, a second edge opposite the first edge a first retention groove running along the first edge and a second retention groove running along the second edge, the first retention groove configured to receive the foot of a corresponding one of the plurality of retention clips and the second retention groove configured to receive a head of a corresponding one of the plurality of retention clips.